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Posted by PeterD on October 15, 2007, 7:21 pm
>
>>
>>>What is the best way, what material to use to thermally insulate 12
>>>meters of sewer pipe ceramic or plastic with 60 cm diameter, from the
>>>surrounding hearth, 2 meters from the surface. Expected temperature 8
>>>to 16 degrees C
>>>Assuming the pipe will be half full of water, that represents a
>>>considerable weight. Any foam product will be compressed to the point
>>>of seriously reduce it's thermal properties.
>>>
>>>Thanks for the help
>>>
>>>John
>>
>>Why do you want to insulate it? It can't freeze, hell it's two meters
>>(your estimate) from the surface. Here in Northern New England (USA)
>>where we see 20 below frequently each year, the frost line is about 4
>>to 5 ft (or a meter and a half).
>
>Peter
>You are correct on everything you say. Actually I am not very far from
>you.
>The air temperature may be -20C but the temperature of the ground at 2
>meters below the surface is about +8 and the temperature of the
>sewer's gray water is about +14 and this pipe is going to be used as a
>storage tank of the sewer heat.
>When building houses on a flat cement slab, don't they thermally
>insulate the slab from the ground?
>
>John
I'm not sure I understand what a 'sewer heat' is? <g> Why would one
care how hot their sewer was?
Sometimes, but not always, slabs are insulated. Gnerally once you are
below the frost line, the ground temperature stablizes. I think all
the insulated slabs I've seen were insulated because they employed a
heated slab system for heating the interior of the building.
Now if you are trying to extract the heat from the waste water (such
as heated gray water) I"m sure there are better ways to do it than
trying ot insualte a pipe two meters down.
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